Carrier PC211 Carrier Comfort Network Inte r face

Note: Unit-mounted starters do not have to be megohm tested.
10. Tighten up all wiring connections to the plugs on the SMM, 8-input, and PSIO modules.
11. Ensure that the voltage selector switch insid e th e power panel is switched t o th e incoming
voltage rating.
12. On machines with free s ta nding starters, inspe ct the power panel to ensure t hat the
contractor has fed th e wires into the bottom of th e panel. Wiring into the top of the panel can
cause debris to fall int o t he contactors. Clean and in spect the contactors if th is has
occurred.
Carrier Comfort Network Inte r face
The Carrier Comfort Net work (CCN) communicatio n bus wiring is supplied and in stalled by
the electrical contra ctor. It consists of shield ed, 3-conductor cable wi th drain wire.
The system elements are connected to the communication bus in a daisy chain
arrangement. The positive pin of each system element communication connector must be wired
to the positive pins of the system element on either side of it; the negative pins must be wired to
the negative pins; the si gna l ground pins must be wire d to signal ground pins.
To attach the CCN communic at ion bus wiring, refer to th e certified drawings an d wir i ng
diagrams. The wire is inserted into the CCN c ommunications p lug (COMM1) on the PSIO
module. This plug also is re fe rred to as J5.
Note: Conductors and drain wire must be 20 AWG (American Wire Gage) minimum stranded,